Patents by Inventor David Pastel

David Pastel has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method for monitoring the position of a fiber
    Patent number: 5519487
    Abstract: A system for monitoring the position of a fiber (13) during drawing is provided. The system includes a beam (25) of radiation which is directed at the fiber (13), a Ronchi ruling (50) having a spatial frequency .omega..sub.M which modulates light scattered from the fiber (13), a lens system (27) having a positive focal length, and a detector (31) located in the back focal plane of the lens system. By arranging the components of the system in this manner, the distance between the fiber (13) and the Ronchi ruling (50) is a linear function of the spatial frequency .omega..sub.D of the modulated light at the detector (29). Various procedures can be used to determine .omega..sub.D, a preferred one being shown in FIG. 9.
    Type: Grant
    Filed: December 30, 1994
    Date of Patent: May 21, 1996
    Assignee: Corning Incorporated
    Inventors: Thomas J. Atwood, David A. Pastel, Bruce W. Reding
  • Method and apparatus for analyzing optical waveguide cane
    Patent number: 5396323
    Abstract: A method and apparatus for non-destructive analysis of canes and preforms which contain "striae" in which the cane or preform is transversely illuminated with a beam of light at a wavelength which is long enough to substantially eliminate the effect of striae resulting from variations in dopant concentration.
    Type: Grant
    Filed: February 7, 1994
    Date of Patent: March 7, 1995
    Assignee: Corning Incorporated
    Inventors: John S. Abbott, III, Donald L. Knasel, David A. Pastel, Bruce W. Reding, Gregory E. Smith